Nov. 6, 2012, 6:55 a.m. EST By Barbara Kollmeyer, MarketWatch MADRID (MarketWatch) — U.S. stock futures pointed higher on Tuesday, drawing some support from gains for Europe stocks, as the presidential race entered its final lap with voting underway. Earnings from AOL Inc. and CVS Caremark Corp. and job-openings data were also on tap. Adding to…